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1.
within / in |
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[解释] within指在时间或距离范围之内，表示“在这一范围内”，“不到”或“不超过”，常和一般将来时，一般现在时或一般过去时连用 in 是经过若干时间，表示“过多少时间”时，通常和一般将来时连用 [经典例句] I’ ll be there within an hour.(一小时之内)/ I’ ll be there in an hour.(一小时之后) |
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[练习]根据句子意思用within或in填空。 1). My birthday is six days away. = My birthday is ______ six days’ time / is ______ six days. 2) He finished drawing the horse ______ ______five minutes. 3). Keep the dictionary _______ your reach. the ground is all wet. 4). My house is_____ walking distance of my university. 答案：1). in; in 2). in / within 3). within 4). within |
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2.
broad / wide / widely / broadly |
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[解释] broad adj. 宽阔的(着重于幅面的宽广)；可修饰背、肩、胸、心胸等的宽阔；开朗 wide adj.&adv. 宽阔的(着重于一边到另一边的宽度)；广泛的 widely adv. 很开(阔)；广泛(多用于引伸意义中) broadly adv. 广泛地；大体上(generally) |
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[练习]根据句子意思用broad，wide，widely，broadly填空。
1). The hotel manager was shocked and stoof there with his mouth ______ open. 2). He was six feet tall, with ______ shoulders. 3). English is _______ used all over the world. 4). _______ speaking, I agree with you. 5). The room is three metres long and two metres _______. 答案：1). wide 2). broad 3). widely 4). Broadly 5). wide / broad |
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3. in / on / to (表示方位) |
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[解释] in “在……之内”，即一个小地方处在一个大地方的范围(疆域)之内。 on “在……端／边”，即一个地方在另一个地方的某一端或某一边，两个地方只是相邻或接壤，却互不管辖。 to “在……面”，即一个地方在另一个地方的范围之外，互不管辖。尤其当两个地方相隔较远，且有湖泊、大海等区域相隔时，通常用to。把河流、山脉、铁路等事物当做两地的分界线或基点，且不说明河流、山脉、铁路等是属于哪一方，通常使用介词to，译为“以……(方向)”。此外，表示一个地方离另一个地方有多远，也用to。 |
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[练习]根据句子意思用in，on，to填空。 1). China faces the Pacific ______ the east. 2). China lies ______ the east of Asia and ______ the east of Japan. 3). North Korea is ______ the northeast of China. 4). Taiwan is ______ the southeast of Fujian Province. 5). The little town lies about one hundred miles ______ the west of Guilin. 答案：1). on 2). in; to 3). on 4). to 5). to |
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4. manage to do sth. / try to do
sth. / attempt to do sth. / seek to do sth. |
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[解释] manage to do sth.= succeed in doing sth. difficult 设法做成某些困难的事 try to do sth. = seek to do sth. 设法做某事(不一定做成) attempt to do sth.= try to so sth. difficult设法做某些困难的事(不一定做成) |
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[练习]根据句子意思用manage，try，attempt，seek的适当形式填空。 1). He was stubborn, but we _______ to persuade him. 2). He _______ to swim across the river, but failed. 答案：1). managed 2). tried/sought/attempted |
质量为m的物体放在地面上，其上表面竖直固定一根轻弹簧，弹簧原长为L，劲度系数为k，下端与物体相连接，如图7-6-3所示．现将弹簧上端P缓慢提一段距离H，使物体离开地面．若以地面为参考平面，试求此时物体的重力势能．
C．弹簧的弹性势能最大 D．弹簧的弹性势能最小